Is Gswc-South San Gabriel Tap Water Safe? Quality Report

Water source: SWP
Ownership: Private
Counties served: Los Angeles

Compliance record

No violations on file. The EPA has no formal drinking-water violations recorded for this supplier.

PFAS detected

PFAS are industrial “forever chemicals”. These are the EPA's latest nationwide test results (2023–2025).

Contaminant	Max	Detection rate	Period
Pfba	0.0056 µg/L	1/8	2024

Other contaminants detected

Each bar shows the measured level as a share of the EPA limit: green is well under, amber is close to it, red is over. For lead and copper the limit applies to exactly the 90th-percentile figure shown, so red there means a real exceedance. For everything else the limit applies to a running annual average while the figure is the 95th percentile of this system's samples — over 100% is worth reading, but is not by itself a violation. Where a single sample came in higher than that percentile, it is noted under the bar. Formal violations are listed separately.

Contaminant	Level vs EPA limit	Detection rate	Source	Period
TTHM	22.1 µg/L 28% of the EPA limit 80 µg/L worst single sample: 30 µg/L	94/661	SYR4	2012–2019
Dibromochloromethane	8.77 µg/L No EPA limit set worst single sample: 10 µg/L	55/672	SYR4	2012–2019
Bromodichloromethane	9.04 µg/L No EPA limit set worst single sample: 9.4 µg/L	37/672	SYR4	2012–2019
Lead	0.0 mg/L 0% of the EPA limit 0.0150 mg/L	33/33	LCR	2023
Bromoform	3.47 µg/L No EPA limit set worst single sample: 3.7 µg/L	27/672	SYR4	2012–2019
Total Haloacetic Acids (HAA5)	12.56 µg/L 21% of the EPA limit 60 µg/L worst single sample: 16 µg/L	23/124	SYR4	2012–2019
Chloroform	9.29 µg/L No EPA limit set worst single sample: 11 µg/L	19/672	SYR4	2012–2019
Dibromoacetic Acid	2.62 µg/L No EPA limit set worst single sample: 2.8 µg/L	19/124	SYR4	2012–2019
Dichloroacetic Acid	7.765 µg/L No EPA limit set worst single sample: 8.8 µg/L	10/124	SYR4	2012–2019
Trichloroacetic Acid	4.4 µg/L No EPA limit set worst single sample: 4.7 µg/L	6/124	SYR4	2012–2019
Monochloroacetic Acid	2.655 µg/L No EPA limit set worst single sample: 2.7 µg/L	4/124	SYR4	2012–2019
Lithium	57 µg/L No EPA limit set	4/8	UCMR-5	2024
Copper	190 µg/L 15% of the EPA limit 1300 µg/L	1/14	SYR4	2012–2019
Lead	17 µg/L 113% of the EPA limit, at the 95th percentile of samples — 15 µg/L	1/4	SYR4	2012–2019

29 contaminants tested, none detected

11Cl-PF3OUdS4:2 Fts6:2 Fts8:2 Fts9Cl-PF3ONSAdonaHfpo-DaMonobromoacetic AcidNetfosaaNfdhaNmefosaaPFBSPfdaPfdoaPfeesaPfhpaPfhpsPfhxaPFHXSPfmbaPfmpaPFNAPFOAPFOSPfpeaPfpesPftaPftrdaPfuna

Utility contact

Contact: ZAKHARI, GEORGE
Phone: 760-515-8322
Email: [email protected]

Frequently asked questions about Gswc-South San Gabriel

Is Gswc-South San Gabriel tap water safe to drink?

EPA monitoring detected 15 contaminants in Gswc-South San Gabriel's water. A detection isn't the same as a violation — most levels are within federal limits. See each level and source above, and the utility's annual Consumer Confidence Report for its official compliance status.

What contaminants were detected in Gswc-South San Gabriel's water?

EPA monitoring detected TTHM, Dibromochloromethane, Bromodichloromethane, Lead, Bromoform, and others. The full list with the level and data source for each is above.

How many people does Gswc-South San Gabriel serve?

Gswc-South San Gabriel reports serving 26,240 people in California, per its EPA record.

Has Gswc-South San Gabriel had any water quality violations?

The EPA has no formal drinking-water violations on file for Gswc-South San Gabriel.

Where does this data come from?

Every figure is official EPA drinking-water monitoring — the Lead & Copper Rule, the UCMR-5 nationwide testing program, and the EPA Six-Year Review — not our own testing. Each number is labelled with its source and period.